Static fluid bed dryers and coolers are ideal for products that are free flowing. This type of dryer is referred to as a static fluid bed because the dryer remains stationary during operation. The static system provides an effective method of drying relatively free flowing particles with a reasonable narrow particles size distribution. The feed may take the form of powders, granules, crystals, seed, pre-forms and agglomerates. A static fluidized bed dryer can be continuous or batch operation and may be round or rectangular. Because there is no mechanical drive system to move the product, the static dryers are lighter and simpler to manufacture – and hence cheaper than the dynamic fluid-bed dryers/coolers. By utilizing a multi-zone scheme, each section of the fluid bed dryer can have an independent temperature and air flow control. Each zone can support a different heating/cooling phase.
Units in continuous and batch type for more uniform materials that do not tend to agglomerate. It is possible to install submerged heat exchangers in a deep static bed. With submerged heat exchangers energy input is both from the fluidizing air as well as from the heat exchangers reducing the size of the equipment and limiting the exhaust air volume.